Yeast Conversion Calculator
Convert between fresh (compressed), active dry, and instant (rapid-rise) yeast. Enter the amount you have and get equivalents for all three types.
About this calculator
Recipes call for different yeast forms, and swapping between them isn't a 1-for-1 substitution because fresh (compressed) yeast is mostly water while active dry and instant yeast are dehydrated, packing far more leavening power into the same gram weight. This calculator uses the commonly cited baking conversion ratios — fresh yeast weight multiplied by roughly 0.4 to get an equivalent active dry weight, and by roughly 0.33 to get an equivalent instant weight — to convert whatever amount and type you have into equivalents for all three forms at once. Enter the amount you're starting with and select which type it is, and the calculator first normalizes it back to a fresh-yeast-equivalent baseline, then derives the other two from there.
Every output scales proportionally with the amount you enter, and because fresh yeast can take up to three times the weight of instant yeast for the same leavening power, selecting the wrong starting type shifts every converted figure by that same multiple — so getting the yeast type right matters just as much as getting the amount right. These ratios are a widely used baking approximation, not a precise laboratory conversion — actual leavening strength varies somewhat by brand, yeast strain, and how the dry yeast was processed, so treat the results as a solid starting point and adjust to taste and rise time on your specific dough.
Inputs
Results
Fresh (compressed) yeast
10 g
How to Use This Calculator
- Enter the amount of yeast you have in grams.
- Select the yeast type you are starting with (Fresh/Compressed, Active Dry, or Instant).
- The calculator shows equivalent amounts for all three yeast types so you can substitute freely.
- Use the displayed gram weight for your chosen substitute to maintain the same leavening power.
How the result changes with Yeast amount
| Yeast amount | Fresh (compressed) yeast |
|---|---|
| 5 | 5 g |
| 7.5 | 7.5 g |
| 15 | 15 g |
| 25 | 25 g |
What each input means
- Yeast amount
- Weight of yeast you currently have.
- Yeast type you have
- The type of yeast the amount above refers to.
What each result means
- Fresh (compressed) yeast
- Equivalent amount of fresh compressed yeast.
- Active dry yeast
- Equivalent amount of active dry yeast.
- Instant yeast
- Equivalent amount of instant/rapid-rise yeast.
How this is calculated
Worked example, using the default values
- Identify Input Parameters2 parametersYeast amount = 10, Yeast type you have (1=Fresh, 2=Active Dry, 3=Instant) = 1 = 2 input(s) provided
- Calculate Fresh (compressed) yeastFresh (compressed) yeast10 = 10
- Calculate Active dry yeastActive dry yeast4 = 4
- Calculate Instant yeastInstant yeast3.3 = 3.3
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why is fresh yeast the heaviest weight for the same leavening power?
Fresh (compressed) yeast is only about 70% water by weight, while active dry and instant yeast are dehydrated to a much lower moisture content. That extra water dilutes the active yeast cells per gram, so you need roughly two to three times as much fresh yeast by weight to match the leavening power of the same recipe's active dry or instant amount.
Can I substitute instant yeast for active dry yeast 1-for-1?
Not quite by this calculator's ratios — instant yeast is slightly more concentrated than active dry, so the conversion uses about 0.33 relative to fresh yeast for instant versus about 0.4 for active dry. In practice many home bakers do substitute them close to 1-for-1 since the difference is small, but for precise proofing times the two aren't identical.
Does the yeast type I select change how much fresh yeast equivalent is calculated?
Yes — the amount you enter is first converted into a fresh-yeast-equivalent baseline using the ratio for whichever type you selected, and every other output is derived from that baseline. Selecting the wrong starting type will shift all three converted amounts by the same proportional error, so it's worth double-checking which yeast you actually have on hand.
Are these conversion ratios exact for every yeast brand?
No — they're widely used baking approximations, not a laboratory-precise figure. Actual leavening strength can vary somewhat between yeast brands, strains, and manufacturing processes, so treat the calculated equivalents as a reliable starting point and adjust proofing time based on how your dough actually rises.
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